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Lee, Ki-Suk
Creative Lab. for Advanced Spin Systems (CLASS)
Research Interests
  • Magnetism, spintronics, spin dynamics, rare-earth free magnet

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Resonant amplification of vortex-core oscillations by coherent magnetic-field pulses

Cited 4 times inthomson ciCited 3 times inthomson ci
Title
Resonant amplification of vortex-core oscillations by coherent magnetic-field pulses
Author
Yu, Young-SangHan, Dong-SooYoo, Myoung-WooLee, Ki-SukChoi, Youn-SeokJung, HyunsungLee, JehyunIm, Mi-YoungFischer, PeterKim, Sang-Koog
Keywords
CELLULAR-AUTOMATA; SHIFT REGISTER; MAGNETORESISTANCE; DYNAMICS; DRIVEN; LOGIC; DISKS; GATE
Issue Date
2013-02
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v.3, no., pp.1 - 6
Abstract
Vortex structures in soft magnetic nanodisks are highly attractive due to their scientific beauty and potential technological applications. Here, we experimentally demonstrated the resonant amplification of vortex oscillations by application of simple coherent field pulses tuned to optimal width and time intervals. In order to investigate vortex excitations on the sub-ns time scale, we employed state-of-the-art time-resolved full-field soft X-ray microscopy of 70 ps temporal and 25 nm lateral resolution. We found that, due to the resonant enhancement of the vortex gyration motion, the signal input power can be significantly reduced to similar to 1 Oe in field strength, while increasing signal gains, by increasing the number of the optimal field pulses. We identified the origin of this behavior as the forced resonant amplification of vortex gyration. This work represents an important milestone towards the potential implementation of vortex oscillations in future magnetic vortex devices.
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DOI
10.1038/srep01301
ISSN
2045-2322
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MSE_Journal Papers
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